Internal gauge for cylinders and the like



H. P. PHILLIPS INVENTOR TTORNEYS WMZ Filed March 2, 1936 oct, 25, 193s.

INTERNAL GAUGE FOR CYLINDERS AND THE LIKE Patented Oct. 25, 1938 UNITEDSTATES lPATiazNT oFFici:

Harold P. Phillips, Hastings, Mich., assigner to giasltings`Manufacturing Company, Hastings,

l ApplicationMarch 2, 1936, Serial No..i66,689

7 Claims. K (Cl. 33-178) The main objects of this invention are: theuser of the instrument but the owner of the First, to provide aninternal gauge well adapted automobile may readily determine thecondition for use in determining and indicating the extent of thecylinder. of wear, if any, in an automobile or other cylin- In theembodiment of my invention illustrated der or cylindrical object. Iindicates a conventional cylinder of an engine. 5

Second, to provide a gauge of the type described My improved gauge isdesignated generally by the which is simple in construction, yetaccurate in numeral 2 and consists of a frame or housing operation. madeup of a pair of side plates 3 and l held in Third, to provide a gaugehaving these advanspaced relation by spacers 5 disposed between tages inthe' use of which an unskilled person can the plates and surrounding thesecuring means 10 determine that a cylinder is worn andapproxi- 6 whichare arranged through the plate 2 and, mately the extent of wear and thelocation of` threaded into the plate 3. The frame or housing the wornor. tapered part thereof. is of such dimensions as to be readily graspedFourth, to provide a gauge having means asand to enter the` cylinders,being oi' substantial sociated therewith for visually indicatingvarialength so that the indicator and indicia end there- 15 tions in thediameter and shape of the cylinder. of project from the cylinder. Themovable parts Objects pertaining to details and economies of are mainlyhoused between the plates.

the invention will denitely appear from the de- Adjacent the inner endsthereof the plates scription to follow. The invention is defined andhave opposed transversely disposed bead-like porpointedv out in theclaims. tions 1 struck out therefrom providing a trans- 20 A structurewhich embodies the features of the verse bore-like recess 8 between theplates. 'Ihis invention is clearly illustrated in the accompanyrecess ispartially threaded as indicated at 9 to ing drawing in which: receivethe screw wall-engaging or contact mem- Fig. 1 is a fragmentarysectional view of a ber III. 'I'his member I0 has a head Ilperiphconventionally illustrated-engine cylinder with erally knurled foreffective grasping, the head 25 my gauge in operative relation therein,certainA having a convexly curved wall contacting surface manipulationsof the gauge being indicated by I2. Screws 6 on either side of memberIII may dotted lines. be tightened to clamp the member in adjusted Fig.2 is a fragmentary plan view of the parts position. shown in Fig. 1.Between the frame or housing plates I mount 30 Fig. 3 is an enlargedfront view of my device the feeler arm I4, the pivot Il' 0f this armbeing with the front housing or frame plate mainly located adjacent therecess 8 so that the outbroken away, the connecting screws a'nd pivotswardly curved short end of the feeler arm probeing sectioned. 4 jectsfrom between the plates. 'I'his projecting Fig. 4 is a sectionallongitudinal section on end is provided witha spherically curved knob 35line 4 4 of Fig. 1, parts being shown in full or feeler I5 alined withthe contact or thrust lines for convenience in illustration. member I0so that this'contact member and the Various means and devices haveheretofore feeler member engage the Walls 0f e Cylinder been resorted toin garages, automobile repair at diametrically opposite points as isclearly 40 shops and the like, for determining the condishown in Fig. 1.The feeler I5 is intended to 40 tion of the cylinder in a' used engine,both-in the have movement imparted thereto by deviations matter ofdetermining the out of round oondior variations in the diameter andshape of the tion thereof and the taper in certain portions cylinderwall. it being under Stood that the cenwhich commonly wear tapered inuse,` These detact or thrust member I0 is iirst adjusted so that vices,so far as my knowledge goes,\heve been its curved face I2 has a touchingor sliding en- 45- rather cumbersome and expensive and require sagementwith the cylinder wall at the portion great Skill and care in use,frequently with unof its minimum diameter. 'Ihisis usually towardsatisfactory resu1ts. Further, with such devices the bottom of theCylinder 0r at the yextreme top it is not easy to show to the customerthe exact thereof beyond the Stroke of the piston. as it 1S condition ofhis engine cylinders. I have proisually found that the point of greatestwear is 50 vided a device which is very simple in operation in the zoneat the upper. end of the piston stroke. but at the same time is positiveand accurate and The long end of the feeler arm terminates in a isprovided with means or indicating ngers curved joint member I6 engaginga correspondwhich may be set to indicate maximum or miniing socket Il inthe short end of the pointer I8 mum readings-or other readings, so thatnot only which is pivoted at I9. Y

'I'he feeler I5 is urged yieldingly outward and lost motion eliminatedby means of the bowed spring 22 which is arranged between the housingplates with one end 23 engaging the inner end of the pointer and itsother end 24 engaging the feeler arm. Its central or intermediate partis bowed at 25 to engage one of the spacing sleeves or frame plateattaching screws.

With this arrangement a simple form of spring serves not only toyieldingly project the feeler or urge it yieldingly outward, but alsoserves to apply actuating thrust to both the pointer and feeler arm,and, as stated, eliminates lost motion in the operating relation ofthese parts.

On the outside of the front plate I mount one or more manuallyadjustable indicating ngers, there being two in the embodimentillustrated,

-designated by the numerals 26 and 21. These are mounted on the pivot I9and are preferably provided with oiisets constituting iinger pieces 29which facilitate grasping or manipulation.

. The friction washer 30 is provided for maintain- A same time it ishighly effective, and is accurate.

ing them in their adjusted positions. 'Ihese indicating lingers projectinto cooperating relation with the gauging scale or indicia 2l 'so thatthey may be independently manipulated or adjusted to the desiredposition. j

In operation, after the contact member III has been adjusted to thediameter of the cylinder to be gauged, the gauge is inserted into thecylinder to the point from which it 'is desired to begin the taking ofmeasurements and manipulated as by rocking as indicated until it isfound that the center of oscillations has been reached, which indicatesthat the feeler and contact member arenormalito the cylinder. One of theindicating ngers may then4 be manually adjusted to coincide with theposition of, thepointer or the gauge may be manipulated to ascertain themaximum and minimum diametersof the cylinder or of any zone thereof, andthe indicating fingers adjusted to indicate the maximum and minimumvariations ofthe gauge.`

With this manipulation the customer can objectively see the variationsin orout of round condition of the cylinder. It also helps the workmanin determining these variations and in making repair records preparatoryto grinding or reboring. While the scale calibrations are quite widelyspaced to facilitate. reading, the scale is actually calibrated inthousandths of an inch, that is, taking into consideration themagnifying of the movement of the pointer through the arrangement ofparts described.

By thus arranging the parts I provide a taper or internal gauge which'is not only extremely sensitive and accurate in operation, but ischaracterized by freedom from lost motion or other objectionable errors,so that great accuracy in manufacture of the parts is not essential toan accurate gauging action. This enables the economical production ofthe instrument; at the and easily manipulated or used by workmen ofmoderate skill. It is also possible to visually demonstrate to thecustomer the condition of the work.

I have illustrated and described my invention in an embodiment whichI-have found highly satisfactory. I have not attempted to illustrateor-describe other adaptations of the invention which are possible as Ibelieve the disclosure made willenable those skilled in the art toembody my invention as may be desired.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is:

1. In an internal gauge, the combination of a frame comprising spacedplates having opposedtransversely disposed bead-like struck-out portionsadjacent one end thereof providing a transverse recess, a contact memberthreaded into said recess .for adjustment and having a rounded workengaging head,. a feeler arm l pivotally mounted between saidplates'adjacent said recess and having aspherically curved work feelerprojecting beyond the edges of said plates and alined with said contactmember, 1 a pointer pivoted between said plates and having a curvedjoint socket in its inner end, said feeler arm being provided with acurved joint portion engagingsaid socket, one of said plates beingapertured adjacent'the free end of said pointer tol expose the same' andcalibrated to provide a scale for coaction therewith, and a springacting to urge said feeler outwardly.

2. In an internal gauge, the combination of a frame comprising spacedplates having opposed transversely. disposed bead-like struck-outportions adjacent one end thereof providing a transverse recess, acontact member threaded into said recess for adjustment and having arounded work engaging head, a feelerV arm'pivotally mounted between saidplates adjacent said recess and having a spherically curved work feelerproject'- ing beyond the edges of said plates and alined with saidcontact member, a pointer pivoted be-..

tween'said plates and having a curved joint socket in its inner end,said feeler arm being provided with a curved joint portion engaging saidsocket,

out portions adjacent one end thereof f'providing a transverse recess, acontact member threaded into said recess for adjustment, a feeler armpivotally mounted between said plates adjacent said recess and having awork feeler projecting beyond the edges of said plates and alined withsaid contact member, a pointer pivoted between said plates andoperatively associated with'said arm, one of said plates being aperturedadjacent the free end of said pointerV to expose the'same 4 andcalibrated to provide a scale for coaction therewith, and a spring meansacting to urge said feeler outwardly.

4. In an internal -gaugefthe combination of a frame comprising a pair ofspaced plates having opposed transversely disposed bead-like struck outportions adjacent one end thereof providing a transverse recess, acontact member threaded otally mounted between said plates adjacent saidrecess and having a work feeler projecting beyond the edges of saidplates and alined with said contact member, a pointer pivoted betweensaid plates and operatively associated withsaid arm, one of said platesbeing apertured adjacent the free end of said pointer to expose the sameandcalibrated to provide a scale for coaction therewith, and a bowedspring medially supported between said plates and having its endsengaging said feeler arm and indicating pointer whereby said armv andpointer are yieldingly urged for pivotal movement in oppositedirections.

5. In an internal gauge for engine cylinders and the like, thecombination of a pair of spaced parallel plates, a pointer pivotallymounted between said plates, one of said plates being calibratedadjacent an end thereof for coaction with said pointer, a feelerpivotally mounted between said plates with one end projecting outwardlytherefrom for engagement with a cylinder wall, its other end beingoperatively associated with said pointer, spring means having the endsthere.- of engaging said feeler and 'pointer respectively, meanssupporting said spring means intermediate the ends thereof, and meanscooperating with the cylinder engaging end of said arm to slidinglyengage a cylinder wall on opposite sides thereof.

6. In an internal gauge for engine cylinders and the like, a frame, acalibration on said frame, a pointer pivotally mounted on said frame formovement with reference to said calibrationa feeler pivotally mounted onthe frame, means operatively engaging said feeler with said pointerwhereby movement of the feeler results in a proportionate movement ofthe pointer relative to the calibration, a. bowed spring having the endsthereof engaging said pointer and feeler respectively to resist suchmovement in one direction thereof, and means on said frame forsupporting the spring intermediate the ends thereof.

.7'. In an internal gauge for engine cylinders and the like, a frame, acalibration on said frame. a pointer pivotally mounted on said frame for.movement with reference to said calibration, a feeler pivotally mountedon the frame, means op- HAROLD P. PHILLIPS.

